Improvement in the on/off ratio of a vertical-type metal-base organic transistor by heat treatment in air

The on/off ratio of a vertical-type metal-base organic transistor was significantly improved by subjecting it to heat treatment in air. The heat treatment of the collector layer and the base electrode reduced the off current that is mainly due to leakage current between the base and the collector, resulting in a considerable decrease in the off current. As a result, a high on/off ratio greater than 105 was achieved, in addition to the low-voltage and high current operation of the vertical-type organic transistor.